<template>
	<view>
		<view class="search-box">
			<uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length!==0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else="">
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>				
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>		
			</view> 
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer:null,
				kw:'',
				//搜索的结果列表
				searchResults:[],
				//搜索历史记录
				historyList:[]
			};
		},
		onLoad(){
			this.historyList=JSON.parse(uni.getStorageSync('kw')||'[]')
		},
		methods:{
			//input输入事件的处理函数
			input(e){
				// console.log(e.value)
				clearTimeout(this.timer)
					
				this.timer=setTimeout(()=>{
					// console.log(e.value)
					this.kw=e.value
					this.getSearchList()
				},1000)
			},
			async getSearchList(){
				//判断搜索关键字是否为空 
				if(this.kw.length===0){
					this.searchResults=[]
					return
				}
				
				const {data:res}=await uni.$http.get('/api/public/v1/goods/search',{query:this.kw})
				if(res.meta.status!==200) return uni.$showMsg()
				this.searchResults=res.message.goods
				
				this.saveSearchHistory()
			},
			gotoDetail(item){
				// console.log(item.goods_id)
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				
				const set=new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				
				// console.log(set)
				this.historyList=Array.from(set)
				
				//对搜索历史数据，进行持久化的存储
				uni.setStorageSync("kw",JSON.stringify(this.historyList))
				
			},
			clean(){
				this.historyList=[]
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query='+kw
				})
			}
		},
		computed:{
			histories(){
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
	.search-box{
		position: sticky;
		top:0;
		z-index: 999;
	}
	
	.sugg-list{
		padding: 0 5px;
		
		.sugg-item{
			display: flex;
			align-items: center;
			justify-content: space-between;
			font-size: 12px;
			padding: 10px 0;
			border-bottom:1px solid #d6efd3;
			
			.goods-name{
				//文字不允许换行
				white-space: nowrap;
				//超出部分隐藏
				overflow:hidden;
				//超出内容使用...代替
				text-overflow: ellipsis;
			}
		}
	} 
	
	.history-box{
		padding: 0 5px;
		
		.history-title{
		display: flex;
		justify-content: space-between;
		height: 40px;
		align-items: center;
		font-size: 13px;
		border-bottom: 1px solid #efefef;
		
		}
		.history-list{
			display: flex;
			flex-wrap: wrap;
			
			.uni-tag{
				margin-top: 5px;
				margin-left: 10px;
				background-color: #4CD964;
			}
		}
	}
</style>
